Talking-machine amplifier.



A. AI HIJ'SEBY.

TALKING MACHINE AMPLIFIER.

APPLICATION FILED JULY 3 I9I6I Patented Dein I9, ISIS 2 SHEETS-SHEET 2.

ALBERT A. HUSEBY, F CHICAGO, ILLINOIS.

TALHING-MACHNE AMPLIFIER.y

ens in g-Maehine bhe foilowing is a,

eh oneis produced by "ee lonfnes or softness.

airy objects or this invenor; viii nn and wh c o the zones produced by .diverting a portion of the Sound warn@ into ihe case or cabine?, of lie insirninen so iliat only such proportion of the sonnd'waves transmitted. di recty from ille machine .iis are required to so gire lie daan-el zione effe-3 Another objeci; is to provide an amplifier and adjusting mechanism therefor which 'wili he simple and dnrible in use.

For the purpose of facilitating an understanding oi my invention l have illustrated on ho accompanying drawings one practical and proorrcd embodiment thereof from an 4g inspection winchj when considered in connection w` lihe following description, lie invanion and of operation should be rraiiiiy a i lv''niiingj lo lie d a finira Figure 1 is a W miren on lie gh :i liking inais; :i

line

Specifictiox: of Letters Patent.

regniaed or modulated to En constructiom cheap toV inanufactm'e, easy to operaie, and accurate atented Der?. 19, 1916. Serial No. 197,296.

of the box or cabinet in which the principal paris the mechanism are housed, and 7' designaes the hinged .lid or cover for the cabinet. Upon the top wall 8 of the case 60 is mounted the usual turntable or roatable support Q upon which the records 11`are plz-:siiioned to be reproduced. The motor and the controlling; mechanisms `therefor, which are carried by the lower face'of the. 65 wail 8,1 are not shown in die present case, Since these parts may be of any well known or preferred 'oons'urucion The Sound tube in the present nstimce preferably com )rises a generally upright poriion/I to the upper end of which. is rigidly connected n horizontally extending portion 13, commonly known as the tone arm, which has fiexibly mounted at its free or forward end a Sound box 14 carrying a 75 stylus; 15 adapted to vengage the :spiral groove or" the record disk 11. The vertical portion l2 of the sound tube is curved forwardly at its ioiiexveiid and is fiared outwardiy to provide the delivery month 16 so which projects through an opening 1'? in 4a. transversely disposed partit-ion 18. The Sound tube may be Supported in any sniiable manner but preferably it is Carried upon a piro'ahsupport (not shown),`the 85 pivotal axi of which is arranged rearwardiy of the tubo and substantially coaxial wih the renter of the opening 1T and the mouth 1li so that when the upper end of the sound tubo is moved laterally across the record disk the lower end or mouth '16` willl simply oscillate in the open-ing 17 about its central axis.

The features ihus far described are more fully shown and explained in detail in cel 95 iain prior applications. but it iS not believed to be necessaryv o enter al; length into a discnseion of those 'features in this case which is concerned morel lnlrticularlyy with he amplifierr` which will now be described.

'The amplifier is mounted forwardly of the pariition 18 to receive the sound waves delivered from the mouth 16 of the sound tubo, and comprises. a pair of side walls 19 V and 20, a top wall 21, and a bottom wall 22 105 which may consist oil a. portion of the floor member i213. The side walls are hinged at chair outer vertical edges to frame members of ihn cabinet; as indicated at 2l and their upper edges are inclined downwardly and 11C inwardly as indicated at l'and forni a support upon which the top wall 21 rests, this i wall being hinged along its outer horizontal edge to a traine member 26 of the cabinet, as shown at 27. The side walls 19 and 20 are oisuchl length that they will engagewitli the transverse partition 18 `before. they are swung to a position parallel with the side walls of the cabinet, but for the purpose of preventing. theouter edges of the side walls 19 and Q0 from wedging against the transverse partition 181 have mounted upon i this partition stop blocks 28 which limit the outward swinging movement of the inner ends of these walls.

The mechanism by 'means of which the lswinging walls 19 and 20 may he adjusted tojposition their inner ends in any desired location with`respectl to the sound tube.,A

comprises a shaft projecting through one of the side walls ofthe vcabinet and supported at its'inner end in a bracket bearing 31, thel outer end of the shaft being pi'ovided las 'from the svvingingf'side Wall 19.

with a linandle-32 adapted to travel across the face of an indicator plate 33 carrying ypiano vand forty lesignations as indicated in Fig. 4. radially projecting arm 34 attached to th'e shaft 29 by a setscrew 35 is connected at its outer end with a link 3G Which in turn is attached at itsl other end to a link 37 near its pivotal connection 38 with a bell Acrank 39. The link 37 is attached at itsother end at'41 to an ear projecting from the outer face of the swinging Wall 20. The bell crank lever is 'pivotally mount-v ed upona pin 42 carried by an angle bracket 43 mounted upon the upperedge of the transverse partition 1P.. In order that this angle plate may be adjusted to the requisite position it is provided with an elongated slot 4:11` through which. a Wood screw 15, threaded into the partition, passes. Another vvwood screw 46', passed through the plate and into the partition, securely holds the'plate' rainst displacement. Another angleplate a L substantially identical in construction with the plate 46, is similarly adjustably fastened to the partition 18 near its other end and has pivotally .mounted upon a pintle 49 a bell crank lever 51 similar to the bell crank 39 These bell cranks are con nected so as to' move in unison by a transverse link 52 andthe outwardly 'extended arm ofthe bell crank 51 is connected by a link 53 withA an' ear fi'extending laterally j lt Will thus be manifest that by moving the handle 32 Iin one direction or the other the inner ends of the Walls 19 and 20 will I be simultaneously and uniformly moved toward or,

frm--ieach other, depending upon the direction of movement oi' the handle 32. Vlhen .,theparts are in the position shown in Fig. "3 the m uth of theI sound tube discharges.- fully into the amplifier which receives and transmits through the open front wall of the cabinet all the sound waves emitted by( the sound tube. `When. however, the side walls 19 and 2() ot the amplilier are swung inwardly toward. each olhcr lhe receiving mouth oi' the amplilier will he more or less contracted both horizontally and vertically so that the sound waves YVlroni thesound tube will 'pass onl partially therethrough, a portion ofthe sound waves being diverted through the' interior ot' the cabinet so thatthe volume ol` sound emitted will be reduced and the tone etl'ect cori-esa)ondingly softened. By swinging the side wlil'ls ol the amplifier inwardly until their iree ends practically meet substantially the 'entire volume of `sound is liverted into and throughtlie interior o'luthe cabinet,producing a very soft' and inullled tone ell'ect. 11i order to prevent any jarring or harsh noises in case the inner ends ot' the1 amplilier side walls are swung into substantial contact, with each other these ends are preferably equipped with.

noisesr4 which might result Jfrom contact of the swinging side/walls with the top wall 2l and. the bottoinAwall Q2, the top andbottom .edges of these side walls vare alsoequipped with similar "felt strips, indicated in Fig. l by'reference characters and 57 respectively. y

A It is believed that my invention and its mode of 'operation will be apparent from the foregoing Without-further description and it should be, obvious that I have provided an amplifier which, while simple in construction and easy to manipulate, is very eiiective and. satisfactoryv in operation andv does not project beyond the contour of the cabinet or mar the'symm'etry of the design- While lI have illustratedand describedV one practica-l and preferred embodiment of the invention it should be-obvious that considerable modification of the Vstructural details may be resorted to Within the purview ofthe invention as defined in the following4 l claims.

I claim 1. In a talking machine, the combination with a'sound tube, of a'n amplifier having a located opposite and registering with the;

delivery mouth of said sound tube. I

2. In a talkin@ machine, the combination with a sound tulbe,v of an amplifier'located opposite the delivery/.mouth of vsaids'ound' 'tube and having hinged.Walls-*permitting a dj iistment of: the .transverse dimensions vof the receiving mouth of Vs-aid amplilier.

3. In a talking machine, the combination with a sound tube, of an amplifier located opposite the delivery mouth of said sound tube, said amplifier having laterally swingving side Walls hinged at the outer vertical edges whereby their inner vertical edges areN adjustable transversely of' thev delivery mouth of said sound tube.

felt strips 55, andsimila,f1y, to prevent,-

contractible and expansible receiving' mouth v 5., In a talkin()- machine, the combination with a sound tu e, of an amplifier located opposite the delivery month of Said sound tube, said amplifier having laterally Swinging side walls formed with ina-'ardly and (lewnwarly incl ined upper edges and hinged ai their' enter vertical edges, and a wp Wall hinged a its enter horizontal edge and resting on the inclined edges of said Sifle Walls, and manually operable means for swinging Said side walls inwacdly and ouhvardly whereby te contract ei.' expend the area of the receiving mouth of said amplifier.

ALBERT A. HUSEBY. 

